Tell us how you feel about security

Do the Boston bombings personally affect the way you feel about security? Please email reporter David Montero at dmontero@ocregister.com.

One way to check on a Boston Marathon runner

Do you know of someone who ran the Boston Marathon? Use this site – http://raceday.baa.org/individual.html – to check to see when they finished by entering their name or bib number. Note: The explosions appeared to happen approximately 4 hours, 9 minutes into the race.

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BOSTON – Investigators appealed to the public Tuesday for amateur video and photos that might yield clues to the Boston Marathon bombing as the chief FBI agent in Boston vowed "we will go to the ends of the Earth" to find whoever carried out the deadly attack.

In Washington, President Obama urged Americans to "speak up" to authorities if they see something suspicious.

Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. Three people were killed, including an 8-year-old boy, and more than 170 were wounded.

A doctor treating the wounded said one of the victims was maimed by what looked like ball bearings or BBs.

Federal investigators said no one had claimed responsibility for the bombings, which took place on one of the city's biggest civic holidays, Patriots Day. But the blasts raised the specter of another terrorist attack on U.S. soil.

On Capitol Hill, Defense Secretary Chuck Hagel called the bombings "a cruel act of terror" and said "a thorough investigation will have to determine whether it was planned or carried out by a terror group, foreign or domestic."

Across the U.S., from Washington to Los Angeles, police tightened security, monitoring landmarks, government buildings, transit hubs and sporting events.

ORANGE COUNTY SECURITY

Law enforcement officials in Orange County braced themselves Monday.

"At this point, we have no reason to believe that the events in Boston are connected to California," said state Homeland Security Advisor Cal EMA Secretary Mark Ghilarducci in a statement. "However, events like this often change on a minute-by-minute basis, and I have directed our State Threat Assessment Center in Sacramento to work with the five regional intelligence centers throughout the state to continue looking at any threats that may emerge."

The Orange County Sheriff's Department planned to increase patrols and visibility of law enforcement officials at public venues and large gathering areas. Other local police agencies say they are monitoring information as it comes in and are prepared to respond to any suspicious activity.

Local airports are bolstering their security as a precaution. There are more law enforcement officials at John Wayne Airport in Santa Ana. Bomb-detecting canines, additional patrol officers and security personnel are present at the Los Angeles International Airport.

A spokeswoman at the Long Beach Airport said officials at the airport have received no information that would cause them to change their security standards. There were no flight delays related to the explosions.

An Anaheim Ducks game is scheduled for Wednesday night. The center's spokesman said they would address security concerns for upcoming events in the next couple of days.

NO UNEXPLODED BOMBS IN BOSTON

In Boston, FBI agent in charge Richard DesLauriers said, "We will go to the ends of the Earth to identify the subject or subjects who are responsible for this despicable crime, and we will do everything we can to bring them to justice."

He said investigators had received "voluminous tips" and were interviewing witnesses and analyzing the crime scene.

Gov. Deval Patrick said that contrary to earlier reports, no unexploded bombs were found. He said the only explosives were the ones that went off.

Injured people and debris lie on the sidewalk near the Boston Marathon finish line following an explosion in Boston, Monday, April 15, 2013. AP Photo/MetroWest Daily News, Ken McGagh
A distraught woman kneels and prays near the finish line of the Boston Marathon on Monday, April 15, 2013. Two bombs exploded seconds apart, creating a bloody and chaotic scene about four hours into the race. John Tlumacki/The Boston Globe
An injured woman is tended to at the scene of the frirst explosion on Boylston Street near the finish line of the Boston Marathon, Monday, April 15, 2013. John Tlumacki/The Boston Globe
Rescue workers remove a man injured in an explosion in Boston, near Monday, April 15, 2013. A series of explosions was reported near the finish line at the Boston Marathon on Monday, leaving two people dead and at least two dozen injured, according to the Boston Police Department. David L. Ryan/The Boston Globe
In this image from video provided by WBZ TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, Monday, April 15, 2013, in Boston. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. WBZTV
People react to a second explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/The Boston Globe, John Tlumacki
People react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. MBR
Medical workers aid injured people at the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/The Boston Globe, David L Ryan
A man tries to comfort a victim near the scene of the first explosion near the finish line of the Boston Marathon, Monday, April 15, 2013. (John Tlumacki/The Boston Globe)
Boston police officers just after an explosion near the finish line of the Boston Marathon, Monday, April 15, 2013. (John Tlumacki/The Boston Globe)
Moments after the first explosion near the finish line of the Boston Marathon, smoke is seen in the background where a second explosion occurred, Monday, April 15, 2013. (David L. Ryan/The Boston Globe)
A Boston police officer clears Boylston Street following an explosion at the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria at the finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/Charles Krupa
Medical workers aid injured people at the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/The Boston Globe, David L Ryan
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/The Boston Globe, David L Ryan
A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. Jim Rogash/Getty Images
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. CHARLES KRUPA, AP
A member of the bomb squad investigates a suspicious item on the road near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. Alex Trautwig/Getty Images
An unidentified Boston Marathon runner is comforted as she cries in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. AP Photo/Elise Amendola
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions near the finish of the Boston Marathon on Monday, killing at least two people, injuring over 20 others. AP Photo/Charles Krupa
Medical workers and authorities work on the scene near the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. AP Photo/WCVB-TV/ABC
Medical responders run an injured man past the finish line the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. CHARLES KRUPA, AP
An unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion in Boston Monday, April 15, 2013. AP Photo/Winslow Townson
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. CHARLES KRUPA, AP
A woman looks on as runners pass near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 28 injured after at least two explosions went off near the finish line to the marathon. Alex Trautwig/Getty Images
Emergency personnel aid the injured after explosions at the Boston Marathon on Monday. CBS NEWS
Police clear the area at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/Charles Krupa
Women react as they walk from the area where there was an explosion after the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Josh Reynolds)
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/Charles Krupa
Medical personnel work outside the medical tent in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. AP Photo/Elise Amendola
State police guard an area near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. Alex Trautwig/Getty Images
Medical workers respond following an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/The Boston Globe, David L Ryan
A Boston police officer wheels in injured boy down Boylston Street as medical workers carry an injured runner following an explosion during the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria at the marathon's finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/Charles Krupa
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. AP Photo/Charles Krupa
A Massachusetts state police officer guards the area containing the medical tent, rear, following an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Josh Reynolds) FR
A Boston police officer patrols the area near the finish line following an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Josh Reynolds) FR

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